CN110004811B - Hot air heating device for serial asphalt pavement and heating control method thereof - Google Patents
Hot air heating device for serial asphalt pavement and heating control method thereof Download PDFInfo
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- CN110004811B CN110004811B CN201910355364.4A CN201910355364A CN110004811B CN 110004811 B CN110004811 B CN 110004811B CN 201910355364 A CN201910355364 A CN 201910355364A CN 110004811 B CN110004811 B CN 110004811B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/14—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces for heating or drying foundation, paving, or materials thereon, e.g. paint
Abstract
According to the hot air heating device and the heating control method for the serial asphalt pavement, provided by the invention, the plurality of hot air heating plates are connected, the heating power of each antipyretic unit is determined by utilizing a continuous variable power heating mode, and the heating units output different heating powers to the asphalt pavement in the driving process, so that the accurate control of the surface temperature and the temperature at the depth of 4cm of the asphalt pavement is realized; meanwhile, the heating units are connected, so that the hot air discharged from the previous heating unit to the environment reenters the air inlet of the next heating unit through the circulating pipeline, the circulating utilization rate of the hot air is further improved, the hot air carrying harmful gas is discharged from the heating unit to the surrounding atmosphere, and the ecological environment is protected.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to a hot air heating device for a serial asphalt pavement and a heating control method thereof.
Background
The in-situ heat regeneration of asphalt pavement adopts special in-situ heat regeneration equipment to heat and mill the asphalt pavement, a certain amount of new asphalt, new asphalt mixture, regenerant and the like are doped in situ, and the technology of regenerating the old asphalt concrete pavement with a certain depth range on the surface is realized once through the working procedures of hot mixing, paving, rolling and the like. In the regeneration process, the generated waste is not required to be carried, the continuous mechanized construction can be carried out on the asphalt pavement, the construction period is short, and the interference to traffic can be reduced to the minimum. Therefore, the in-situ heat regeneration technology of the asphalt pavement not only can save a large amount of asphalt and sand materials and reduce the engineering cost, save the material transportation cost and the storage occupation of old materials, but also greatly reduce the environmental pollution, and has good economic and social benefits.
Currently, there are 3 common in-situ thermal regenerative heating technologies: microwave heating, hot air circulation heating and infrared radiation heating. Among them, the heating by hot air circulation is most widely used. The hot air circulation heating is a method for heating the ground by burning fuel oil to heat air and then continuously circulating the hot air through a circulating device.
The in-situ heat regeneration technology of the asphalt pavement is mainly used for heating the asphalt pavement to enable the temperature of a certain depth to reach the milling requirement, so that a milling machine can conveniently mill the pavement, and other materials are added, thereby realizing the heat regeneration of the asphalt pavement. In general, the milling temperature required for in-situ thermal regeneration of an asphalt pavement is 180 ℃ above the surface temperature of the asphalt pavement and 100 ℃ at a depth of 4 cm. Because the heater is above the asphalt pavement, heat is transferred downwards from the surface of the asphalt pavement layer by layer, so that the temperature of the surface of the asphalt pavement is increased fastest, and the deeper the pavement depth is, the slower the temperature is increased. This means that the pavement surface will first reach 180 c, while a temperature of 4cm will require a further heating period to reach the required temperature. If the heating power of the heating unit is too high, the temperature of the surface of the asphalt pavement rises too fast, and the surface is difficult to control, so that the surface can be burnt; if the power is too low, the heating time of in-situ thermal regeneration can be prolonged, and the energy consumption of fuel can be increased.
At present, hot air heating of asphalt pavement is mainly performed by using a plurality of heaters, and each heater is provided with a set of heating unit. After the asphalt pavement is heated by hot air, a part of the hot air is sucked into the circulating fan again, and the rest part of the hot air is discharged into the atmosphere. And the harmful gas contained in the hot air is discharged to the atmosphere, thereby polluting the environment. Meanwhile, the hot air heating plate close to the asphalt pavement is exposed to the surrounding environment, so that the heat of the hot air is continuously dissipated into the surrounding air. This reduces the efficiency of hot air utilization, increases the amount of fuel burned, and thus causes fuel waste.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a hot air heating device of a serial asphalt pavement and a heating control method thereof, which overcome the problems and defects that waste gas is discharged to the surrounding environment and heat is dissipated by a hot air heating plate in the existing hot air heating process.
The invention is realized by the following technical scheme:
the hot air heating device for the serial asphalt pavement comprises a plurality of heating units which are connected end to end in sequence, wherein the tail end of each heating unit is provided with a temperature acquisition device;
the heating unit comprises a walking frame, a fuel combustion chamber and a circulating fan are arranged on the walking frame, and a heating device is arranged at the bottom of the walking frame; the outlet of the circulating fan is connected with the inlet of the fuel combustion chamber, the hot air outlet of the fuel combustion chamber is connected with the inlet of the heating device, the bottom of the heating device is provided with an air outlet, the bottom of the heating device is also provided with a circulating sleeve pipe, and the circulating sleeve pipe is used for collecting hot air heated by the asphalt pavement and inputting the hot air into the circulating fan of the heating unit adjacent to and behind the heating unit;
and each heating unit is also provided with a control unit, the temperature acquisition device is used for acquiring the surface temperature of the heated asphalt pavement, and the control unit adjusts the heating output power of the heating unit according to the acquired surface temperature.
Preferably, the heating device comprises an outer frame and a hollow heating plate which are sealed in a circumferential direction, the top of the outer frame is connected with the bottom of the walking frame, the top plate of the heating plate is connected with the bottom of the outer frame, a heating area of an asphalt pavement is formed among the bottom of the heating plate, the side wall of the outer frame and the surface of the asphalt pavement, an inlet of a circulating sleeve is arranged on the outer frame and is communicated with the heating area, and an outlet of the circulating sleeve is connected with an inlet of a circulating fan of an adjacent rear heating unit.
Preferably, a plurality of hot air diversion holes are uniformly distributed at the bottom of the heating plate.
Preferably, a heat protection plate is further arranged between the outer frame and the heating plate, and the heating temperature of the heat protection plate is equal to that of the heating plate.
Preferably, a heat insulation layer is arranged between the outer frame and the heat protection plate and between the heat protection plate and the heating plate.
Preferably, the hot air outlet of the fuel combustion chamber is connected with the top surface of the heating plate through an equipartition pipeline.
Preferably, the walking frame comprises a partition plate and a supporting wheel arranged at the bottom of the partition plate.
Preferably, the temperature acquisition device is an infrared thermometer.
Preferably, the plurality of heating units are moved by a tractor, and the tractor is connected with the heating unit at the forefront end.
The invention also provides a heating control method of the hot air heating device of the serial asphalt pavement, which is characterized by comprising the following steps:
s1, sequentially marking a plurality of heating units as a first heating unit and a second heating unit;
s2, acquiring the surface temperature of the heated asphalt pavement by an infrared thermometer at the tail end of the first heating unit, sending the surface temperature to a control unit of the first heating unit, executing a step S3 when the surface temperature is lower than or higher than a surface preset temperature, and executing a step S4 when the surface temperature is equal to the surface preset temperature;
s3, the control unit adjusts the output heating power of the first heating unit, and the heating output power of the Nth heating unit on the asphalt pavement is as follows:
P N ＝h*A*(T hot air -T N-1 )
Wherein P is N Heating output power of the Nth heating unit when the asphalt pavement is heated to a preset temperature; h is the convective heat transfer coefficient of the asphalt pavement; a is a heat transfer area; t (T) Hot air The temperature of the hot air; t (T) N-1 N=1.2.3..n, where N is 1, T is the temperature of the surface of the asphalt pavement before heating by the nth heating unit N-1 Is the natural temperature of the asphalt pavement;
s4, the second heating unit heats the asphalt pavement heated by the first heating unit again according to the maximum heating output power, the infrared thermometer of the second heating unit collects the surface temperature of the asphalt pavement heated again and sends the surface temperature to the control unit of the second heating unit, when the surface temperature is lower than or higher than the surface preset temperature, the control unit adjusts the heating output power of the second heating unit according to the method of the step S3, and when the temperature is equal to the surface preset temperature, the step S5 is executed;
s5, sequentially regulating and controlling the heating output power of each heating unit according to the method of the step S4;
s6, after the Nth heating unit heats the asphalt pavement, milling the pavement heated by the milling machine set, and detecting whether the temperature at the preset depth is a preset temperature;
s7, when the temperature at the preset depth is higher than the preset temperature, the moving speed of the heating unit is increased, the heating time is shortened, and when the temperature at the preset depth of the planing road surface is lower than the preset temperature, the moving speed of the heating unit is reduced, and the heating time is increased;
s8, repeating the steps S6 and S7 until the temperature at the preset depth of the pavement is equal to the preset temperature, acquiring the moving speed of the heating unit at the moment, and heating all the pavement to be milled by the heating unit according to the acquired moving speed.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the hot air heating device for the serial asphalt pavement, provided by the invention, the plurality of hot air heating plates are connected, the heating power of each heating unit is determined by utilizing a continuous variable power heating mode, and the heating units output different heating powers to the asphalt pavement in the driving process, so that the accurate control of the surface temperature of the asphalt pavement and the temperature at a designated depth is realized; meanwhile, the plurality of heating units are connected, so that hot air discharged to the environment by the previous heating unit enters the air inlet of the next heating unit again through the circulating pipeline, the circulating utilization rate of the hot air is further improved, and the heating time is shortened; meanwhile, when the hot air circulates to the last heating unit, the harmful gas in the hot air is accumulated to the last heating unit, and besides most of the hot air for circularly heating the pavement again, the hot air dissipated to the surrounding atmosphere can be treated by unified waste gas, so that the economic cost of waste gas treatment is reduced, the hot air carrying the harmful gas is discharged to the surrounding atmosphere by the heating unit, and the ecological environment is protected.
And hot air diversion holes are formed in the bottom of the heating plate, so that the heating temperature of the road surface is ensured to be consistent.
The periphery of the heating plate is provided with the heat protection plate, and the temperature of the heat protection plate is equal to that of the heating plate, so that the temperature difference between the heat protection plate and the heating plate is eliminated, the heat of the heating plate is prevented from being diffused to the periphery, and the heat utilization rate is improved. Due to the control accuracy, the temperature of the heat shield plate is allowed to slightly fluctuate back and forth around the temperature of the heating plate.
The heat insulation layer is further arranged in the heating device to prevent heat loss, so that the energy utilization rate is further improved.
The invention also provides a heating control method of the hot air heating device of the serial asphalt pavement, the heating unit adopts closed loop control, the heating output power of the first heating unit is regulated and controlled by collecting the temperature of the pavement heated by the first heating unit and taking the temperature as a reference, then the pavement heated by the first heating unit is heated again by the second heating unit, the temperature of the pavement heated by the second heating unit is collected, the heating output power of the second heating unit is regulated and controlled, and the control of the output heating power of all the heating units is completed in the similar way. And then, controlling the temperature of the appointed depth under the pavement by controlling the moving speed of all the heating units, so that the surface temperature of the asphalt pavement and the temperature of the appointed depth are accurately controlled, the utilization rate of energy sources is improved, and the waste of fuel is reduced.
Drawings
FIG. 1 is a front view of the device of the present invention;
FIG. 2 is a cross-sectional view of a heating device of the present invention;
FIG. 3 is a horizontal cross-sectional view of the heating device of the present invention;
FIG. 4 is a diagram of the distribution of hot air tap holes;
FIG. 5 is a top view of the device of the present invention;
FIG. 6 is a schematic view of the structure of the heat shield plate of the present invention;
FIG. 7 is a logic diagram of a heating control method of the present invention;
FIG. 8 is a graph showing the heating power of each heating plate in the continuous variable power heating process of the present invention;
FIG. 9 is a graph showing the temperature change of each depth layer of the asphalt pavement when each heating unit reaches steady-state heating;
in the figure: 01-heating means; 02-a tractor; 03-a fuel combustion chamber; 04-a circulating fan; 05-an engine; 06-connecting means; 07-a hot air pipe; 08-heating plate; 09-separator; 10-supporting wheels; 11-circulation sleeve; 12-hot air diversion holes; 16-a heat shield plate; 17-a heat insulation layer; 18-an outer frame; 20-asphalt pavement; 21-a heat shield plate binding post; 23-a hot air cavity.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, which illustrate but do not limit the invention.
Referring to fig. 1-9, a hot air heating device for a serial asphalt pavement comprises a tractor 02, a plurality of heating units and a temperature acquisition device, wherein the heating units are sequentially connected end to end, two adjacent heating units are connected through a connecting device 06, the tractor 02 is connected with the heating unit at the forefront, and the tractor provides forward power for the heating unit at the rear.
Each heating unit adopts closed-loop control, a control unit is arranged on each heating unit, an infrared thermometer is arranged at the tail end of each heating unit and is used for measuring the surface temperature of the asphalt pavement, the infrared thermometer is connected with the control unit, and the control unit controls the output heating power of the corresponding heating unit according to the parameters acquired by the infrared thermometer.
The heating unit comprises a walking frame, the walking frame comprises a partition plate 9 and a supporting wheel 10 arranged at the bottom of the walking frame, a fuel combustion chamber 03, a circulating fan 04 and an engine 05 are arranged at the top of the partition plate 9, a heating device 01 is arranged at the bottom of the partition plate 9, and the heating device 01 is connected with the fuel combustion chamber 03 through a hot air pipe 07.
The circulating fan 04 is connected with the fuel combustion chamber 03, the engine 05 is connected with the circulating fan 04, the engine provides power for the circulating fan 04, the circulating fan 04 continuously absorbs ambient temperature wind, namely cold wind, and the cold wind enters the fuel combustion chamber 03, the fuel combustion chamber 03 heats the cold wind entering the fuel combustion chamber 03 by combusting fuel, the cold wind absorbs heat of fuel combustion, the temperature of the cold wind rises to be converted into hot wind, the hot wind enters the heating device 01 through the hot wind shunt tube 07 through the partition plate 09, and the hot wind is sprayed out through the bottom of the heating device to heat the asphalt pavement.
With continued reference to fig. 2, the heating device 01 includes an outer frame 18, a heat shield plate 16, and a heating plate 08, which are disposed in this order from the outside to the inside.
The outer frame 18 is arranged at the bottom of the partition plate 9, the outer frame 18 and the heat protection plate 16 are both box body structures with lower ends open, the outer frame 18 is sleeved outside the heat protection plate 16, the heating plate 08 is of a hollow structure, the space inside the heating plate 08 is a hot air cavity 23, the heating plate 08 is sleeved inside the heat protection plate 16, and one end of a bolt penetrates through the partition plate to connect the heat protection plate 16 of the outer frame 18 with the heating plate 08.
One end of the hot air pipe 07 is connected with the fuel combustion chamber 03, and the other end sequentially passes through the partition plate 09, the outer frame 18, the heat protection plate 16 and the top of the heating plate 08 to be communicated with the hot air cavity 23, and the lower end of the outer frame 18 is lower than the bottom surface of the heating plate 08, so that an asphalt pavement heating area is formed among the bottom of the heating plate 08, the side wall of the outer frame 18 and the surface of the asphalt pavement 20.
With continued reference to fig. 3, thermal insulation layers 17 are provided between the outer frame 18 and the side walls and top of the heat shield plates 16, and between the heat shield plates 16 and the side walls and top of the heater plates 08.
With continued reference to fig. 4, the heat component enters the hot air cavity 23 through the hot air pipe 07, and a plurality of hot air diversion holes 12 are uniformly distributed at the bottom of the heating plate 08, and the heat component is uniformly sprayed onto the asphalt pavement 20 through the hot air diversion holes 12 to heat the asphalt pavement, so that the asphalt pavement is heated more uniformly.
The lower part of the side wall of the outer frame 18 is connected with a circulating sleeve 11, one end of the circulating sleeve 11 is communicated with a heating zone of the asphalt pavement, and the other end of the circulating sleeve 11 is connected with an air inlet of a circulating fan 04 of an adjacent heating unit.
With continued reference to fig. 5, from left to right, the circulation sleeve 11 of the first heating unit is connected to the air inlet of the circulation fan 04 of the second heating unit, and the circulation sleeve 11 of the second heating unit is connected to the air inlet of the circulation fan 04 of the third heating unit, in turn, until reaching the last heating unit.
Because the plurality of heating units slowly move to heat the asphalt pavement 20, after the hot air is heated on the asphalt pavement 20 through the hot air diversion holes 12, a small amount of hot air is dissipated to the environment, and a part of hot air is returned to the circulating fan 04 of the heating unit and then is sent into the fuel combustion chamber 03 through the circulating fan 04 to be heated for cyclic utilization; the rest hot air enters the circulating fan 04 of the next heating unit through the circulating sleeve 11, then enters the fuel combustion chamber 03 together with cold air absorbed by the circulating fan 04 of the next heating unit, is heated and converted into hot air reaching the temperature required by in-situ thermal regeneration, the hot air is divided into three parts after being heated by the asphalt pavement, a small amount of the hot air is also radiated to the surrounding environment, a part of the hot air reenters the circulating fan of the heating unit, and the rest hot air enters the circulating fan of the next heating unit through the circulating sleeve and is reciprocated. When the hot air circulates to the last heating unit, the hot air heated by the asphalt pavement is divided into two parts: most of hot air reenters the circulating fan of the heating unit, and the rest of hot air can be subjected to uniform waste gas treatment through the circulating sleeve, so that harmful gas in the hot air is eliminated, and the ecological environment is further protected.
Temperature sensors are embedded in both the heating plate 08 and the heat shield plate 16 for monitoring the temperatures of the heating plate 08 and the heat shield plate 16. Because of the extremely high heat in the hot air chamber 23, the temperature of the heating plate 08 around the hot air chamber 23 is also increased. The heat insulating layer 17 is filled between the heating plate 08 and the heat protection plate 16, and the main function of the heat insulating layer is to reduce heat dissipation of the heating plate 08 outwards as much as possible.
The function of the heat shield plate 16 is to heat the asphalt pavement 20 by heating the heat shield plate 16 to the same temperature as the heating plate 08, prevent the temperature of the heating plate 08 from diffusing to a low temperature region, isolate the heat dissipation of the hot air to the heat shield plate 16 through the heating plate 08, and maximize the possibility of heat.
Between the heat shield plate 16 and the outer frame 18, a heat insulating layer 17 is also filled in order to reduce the heat dissipated outwards by the heat shield plate 16 and thus reduce the energy consumption for heating the heat shield plate 16 to the same temperature as the 08 heater plate.
With continued reference to fig. 6, the heat shield 16 is made of copper, and has a resistance wire embedded therein, and is connected to a power source through a heat shield terminal 21, so that the resistance wire generates heat, thereby providing heat to the heat shield 16.
The fuel combustion chamber 03 is filled with fuel, and cold air entering the fuel combustion chamber 03 absorbs heat energy released by the fuel and then is converted into hot air capable of heating the asphalt pavement through combustion.
The circulating fan 04 absorbs cold air in the surrounding environment, and simultaneously absorbs hot air heated by the asphalt pavement, and sends the hot air into the fuel combustion chamber for heating.
The hot air pipe 07 adopts a heat-resistant heat-insulating material to transfer heated hot air into the hot air cavity.
The 11 circulation sleeve is made of metal, threads are milled on the outer wall of the sleeve, and the 11 circulation sleeve is connected with the 18 outer frame through the threads. The circulating sleeve conveys the heated hot air of the asphalt pavement to a circulating fan of the next heating unit for recycling, and reduces the discharge of the hot air to the surrounding atmosphere so as to avoid environmental pollution.
The hot air diversion holes 12 enable the hot air entering the hot air cavity to be evenly sprayed on the asphalt pavement, so that the asphalt pavement is evenly heated.
The outer frame 18 is made of insulating material and serves as the outermost layer of the whole heating area structure and is connected with the circulation sleeve.
The hot air cavity 23 is used for accumulating hot air after the hot air is heated by the fuel combustion chamber, and the hot air flows out through the hot air diversion holes after the asphalt pavement begins to be heated.
As shown in fig. 7, the following describes in detail a heating control method of a hot air heating device for a serial asphalt pavement, which includes the following steps;
s1, sequentially marking a plurality of heating units as a first heating unit and a second heating unit;
s2, an infrared thermometer at the tail end of the first heating unit collects the surface temperature of the heated asphalt pavement and sends the surface temperature to a control unit of the first heating unit,
when the surface temperature is lower than or higher than 180 ℃, executing step S3, and when the temperature is equal to 180 ℃, the heating unit reaches a stable state, and executing step S4;
s3, the control unit controls the output heating power of the first heating unit, and the heating power of the Nth heating unit on the asphalt pavement is as follows;
P N ＝h*A*(T hot air -T N-1 )
Wherein P is N The heating output power of the Nth heating unit is W when the asphalt pavement is heated to a preset temperature; h is the convection heat transfer coefficient W/(m) of the asphalt pavement 2 * K) The method comprises the steps of carrying out a first treatment on the surface of the A is the heat transfer area, i.e. the heating area m of the heating plate 2 ；T Hot air The temperature K of the hot air; t (T) N-1 N=1.2.3..n, where N is 1, T is the temperature of the surface of the asphalt pavement before heating by the nth heating unit N-1 Is the natural temperature of the asphalt pavement.
In general, the convective heat transfer coefficient h of an asphalt pavement is calculated according to the Solaimanian empirical formula as follows:
wherein v is the wind speed of the hot air, m/s.
From the above formula: the convective heat transfer coefficient h is proportional to the hot air velocity v. Therefore, when the air temperature of the hot air is constant, the air speed of the hot air is controlled to adjust the convection heat exchange coefficient, and the purpose of controlling the heating power is further realized.
Concretely, when the surface temperature of the asphalt pavement is higher than 180 ℃, the first heating unit can reduce the wind speed of hot air by controlling the circulating fan, so that the surface temperature of the asphalt pavement is reduced; when the surface temperature of the asphalt pavement is lower than 180 ℃, the first heating unit increases the wind speed of hot air by controlling the circulating fan, so that the surface temperature of the asphalt pavement is increased.
S4, the second heating unit heats the asphalt pavement heated by the first unit again according to the maximum heating output power, the infrared thermometer of the second heating unit collects the surface temperature of the asphalt pavement heated again and sends the surface temperature to the control unit of the second heating unit, when the surface temperature is lower than or higher than the surface preset temperature, the control unit adjusts the heating output power of the second heating unit according to the method of the step S3, and when the temperature is equal to the surface preset temperature, the step S5 is executed;
s5, regulating and controlling the heating output power of each heating unit in sequence according to the method of the step S4.
The second heating unit heats the pavement on the basis of the heating of the asphalt pavement by the first heating unit, so that the heating output power of the second heating unit for heating the pavement to the same preset temperature is smaller than that of the first heating unit, and the heating output power of the third heating unit is smaller than that of the second heating unit, and the heating output power of the third heating unit is sequentially decreased.
When the heating power of each heating unit is adjusted and the heating of the asphalt pavement reaches a stable state, the temperature change trend of the surface, the depth of 2cm and the depth of 4cm of the asphalt pavement after the heating of all the heating units is shown in fig. 9.
And S6, judging whether the temperature of the 4cm depth of the asphalt pavement reaches 100 ℃ after all the heating units heat the asphalt pavement, and controlling the speed of the tractor through a tractor cab, wherein the control system is a closed-loop control system independent of a control system of the heating units.
The specific measures are as follows: the tractor is followed by a milling machine set for milling the asphalt pavement, and an infrared thermometer is arranged on the milling machine set and is used for measuring the temperature at the depth of 4 cm. When all the heating units are used for heating the asphalt pavement, the milling vehicle is used for milling the asphalt pavement with the length of more than 4cm, the infrared thermometer is used for measuring the temperature at the position of 4cm and transmitting the temperature to the cab of the tractor, and the cab is used for judging the temperature.
S7, when the temperature at the preset depth is higher than the preset temperature, the moving speed of the heating unit is increased, the heating time is shortened, and when the temperature at the preset depth of the planing road surface is lower than the preset temperature, the moving speed of the heating unit is reduced, and the heating time is increased;
the specific measures are as follows: when the temperature at the depth of 4cm is lower than 100 ℃, the heating time of the asphalt pavement is increased by reducing the speed of the tractor, so that the temperature at the depth of 4cm is further increased; when the temperature at the depth of 4cm is higher than 100 ℃, the heating time of the asphalt pavement is reduced by increasing the speed of the tractor, and the temperature at the depth of 4cm is further reduced.
S8, repeating the steps S6 and S7 until the temperature at the preset depth of the pavement is equal to the preset temperature, acquiring the moving speed of the heating unit at the moment, and heating all the pavement to be milled by the heating unit according to the acquired moving speed.
In the actual construction process, due to the delay time of feedback of the closed-loop system, a certain adjustment of the in-situ thermal regeneration process of the asphalt pavement is allowed. Although the heating effect of this part of the thermal regeneration section for regulation is difficult to meet, this part of the regulation section is extremely small with respect to tens of thousands of heating mileage.
In the actual construction process, the thermal physical parameters such as the heat conductivity coefficient, the density, the specific heat capacity and the like of the asphalt pavement of each road section have certain differences, so that the heating power of each heating unit after reaching a stable state is allowed to slightly fluctuate up and down by one value.
For the actual heating process, it is difficult to control each heating unit to gradually decrease the power according to the continuously variable power curve to heat the road surface, so the heating method of the present invention forms a stepped heating curve according to the heating power determined when each heating unit is in a stable heating state, since the heating power of each heating unit is gradually decreased, as shown in fig. 8. When the heating units are more, the steps are more dense, and the formed step heating curve is more similar to the ideal continuous variable power heating curve. After the wind speed and the wind temperature of the hot wind are determined, starting the engine, and conveying cold wind to the fuel combustion chamber by the circulating fan, wherein the fuel combustion chamber starts to heat the cold wind.
The heat-protection plate is further connected to a programmable power supply through the heat-protection plate binding post, and is electrified and heated. And meanwhile, temperature sensors which are buried in advance on the surfaces of the heat protection plate and the heating plate are connected to a control unit, the temperatures of the heat protection plate and the heating plate are monitored, and the temperature of the heat protection plate is controlled by controlling the power of the programmable power supply through the control unit.
After the asphalt pavement is heated by the hot air, a small amount of hot air is dissipated into the surrounding environment because the heating process is dynamic, a part of hot air returns to the circulating fan of the heating unit, and the rest of hot air is absorbed into the circulating fan of the next heating unit, so that the hot air is recycled.
Further, a plurality of heating units can be arranged, so that the heating power of a plurality of heating plates can be determined, the formed stepped heating curve is closer to a continuous variable power curve, and the heating process is closer to a continuous variable power heating project.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The hot air heating device for the serial asphalt pavement is characterized by comprising a plurality of heating units which are sequentially connected end to end, wherein the tail end of each heating unit is provided with a temperature acquisition device;
the heating unit comprises a walking frame, a fuel combustion chamber (03) and a circulating fan (04) are arranged on the walking frame, and a heating device (01) is arranged at the bottom of the walking frame; the outlet of the circulating fan (04) is connected with the inlet of the fuel combustion chamber (03), the hot air outlet of the fuel combustion chamber (03) is connected with the inlet of the heating device (01), the bottom of the heating device (01) is provided with an air outlet, the bottom of the heating device (01) is also provided with a circulating sleeve (11), and the circulating sleeve (11) is used for collecting hot air heated by an asphalt pavement and inputting the hot air into the circulating fan (04) of the heating unit adjacent to and behind the heating unit;
each heating unit is also provided with a control unit, the temperature acquisition device is used for acquiring the surface temperature of the heated asphalt pavement, and the control unit adjusts the heating output power of the heating unit according to the acquired surface temperature;
the heating device comprises an outer frame (18) which is sealed in a circumferential direction and a hollow heating plate (08), wherein the top of the outer frame (18) is connected with the bottom of the walking frame, the top plate of the heating plate (08) is connected with the bottom of the outer frame (18), a heating area of an asphalt pavement is formed among the bottom of the heating plate (08), the side wall of the outer frame (18) and the surface of the asphalt pavement (20), an inlet of a circulating sleeve (11) is arranged on the outer frame (18) and is communicated with the heating area, and an outlet of the circulating sleeve (11) is connected with an inlet of a circulating fan (04) of an adjacent rear heating unit;
when the hot air circulates to the last heating unit, the rest part of the hot air is subjected to unified waste gas treatment through the circulating sleeve.
2. The hot air heating device for the tandem asphalt pavement according to claim 1, wherein a plurality of hot air diversion holes (12) are uniformly distributed at the bottom of the heating plate (08).
3. The hot air heating device for the tandem asphalt pavement according to claim 1, wherein a heat protection plate (16) is further arranged between the outer frame (18) and the heating plate (08), and the heating temperature of the heat protection plate (16) is equal to the temperature of the heating plate (08).
4. A hot air heating apparatus for a tandem asphalt pavement according to claim 3, wherein a heat insulating layer (17) is provided between the outer frame (18) and the heat protection plate (16) and between the heat protection plate (16) and the heating plate (08).
5. The hot air heating apparatus of the tandem asphalt pavement according to claim 1, wherein the hot air outlet of the fuel combustion chamber (03) is connected with the top surface of the heating plate (08) through an average distribution pipeline.
6. The hot air heating device for a tandem asphalt pavement according to claim 1, wherein the traveling frame comprises a partition plate (9) and a supporting wheel (10) provided at the bottom thereof.
7. The hot air heating device for the serial asphalt pavement according to claim 1, wherein the temperature acquisition device is an infrared thermometer.
8. The hot air heating apparatus for a tandem asphalt pavement according to claim 1, wherein the plurality of heating units are moved by a tractor, and the tractor is connected to the foremost heating unit.
9. A heating control method of the hot air heating apparatus for a tandem asphalt pavement according to any one of claims 1 to 8, comprising the steps of:
s1, sequentially marking a plurality of heating units as a first heating unit and a second heating unit;
s2, acquiring the surface temperature of the heated asphalt pavement by an infrared thermometer at the tail end of the first heating unit, sending the surface temperature to a control unit of the first heating unit, executing a step S3 when the surface temperature is lower than or higher than a surface preset temperature, and executing a step S4 when the surface temperature is equal to the surface preset temperature;
s3, the control unit adjusts the output heating power of the first heating unit, and the heating output power of the Nth heating unit on the asphalt pavement is as follows:
P N ＝h*A*(T hot air -T N-1 )
Wherein P is N Heating output power of the Nth heating unit when the asphalt pavement is heated to a preset temperature; h is the convective heat transfer coefficient of the asphalt pavement; a is a heat transfer area; t (T) Hot air The temperature of the hot air; t (T) N-1 N=1.2.3..n, where N is 1, T is the temperature of the surface of the asphalt pavement before heating by the nth heating unit N-1 Is the natural temperature of the asphalt pavement;
s4, the second heating unit heats the asphalt pavement heated by the first heating unit again according to the maximum heating output power, the infrared thermometer of the second heating unit collects the surface temperature of the asphalt pavement heated again and sends the surface temperature to the control unit of the second heating unit, when the surface temperature is lower than or higher than the surface preset temperature, the control unit adjusts the heating output power of the second heating unit according to the method of the step S3, and when the temperature is equal to the surface preset temperature, the step S5 is executed;
s5, sequentially regulating and controlling the heating output power of each heating unit according to the method of the step S4;
s6, after the Nth heating unit heats the asphalt pavement, milling the pavement heated by the milling machine set, and detecting whether the temperature at the preset depth is a preset temperature;
s7, when the temperature at the preset depth is higher than the preset temperature, the moving speed of the heating unit is increased, the heating time is shortened, and when the temperature at the preset depth of the planing road surface is lower than the preset temperature, the moving speed of the heating unit is reduced, and the heating time is increased;
s8, repeating the steps S6 and S7 until the temperature at the preset depth of the pavement is equal to the preset temperature, acquiring the moving speed of the heating unit at the moment, and heating all the pavement to be milled by the heating unit according to the acquired moving speed.
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| CN112900213B (en) * | 2021-01-25 | 2022-11-25 | 江苏集萃道路工程技术与装备研究所有限公司 | Hot air circulation heating device with temperature control system and temperature control method |
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